I use them quite a bit. I don't know about ankle injuries, but they definitely help with calf strains and cramps. Without it, there's a 90% chance I'll get a cramp...with it, it's more like 5%. And in both conditions, I stretch out before playing.

im actually having the same problem. my left leg is killing me. particually the tendons behind my knee area. anyone know how to get healthy??

Are you sure its the tendons? Try to be a little more specific about what type of movements hurt and where specifically it hurts and what kind of pain it is.

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do long socks help? i heard they prevente ankle injuries.

Long socks have nothing to do with ankle injuries. If you have a history of ankle injures and want to prevent further injury get a pair of ankle braces. The lightest, most comfortable and least restrictive I've tried are ASO. (the same ones that Chauncey Billups wears for example).